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    <div class="refentry" id="glBindFragDataLocationIndexed">
      <div class="titlepage"/>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glBindFragDataLocationIndexed — bind a user-defined varying out variable to a fragment shader color number and index</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glBindFragDataLocationIndexed</strong>(</code>
              </td>
              <td>GLuint <var class="pdparam">program</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLuint <var class="pdparam">colorNumber</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLuint <var class="pdparam">index</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>const char *<var class="pdparam">name</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>program</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The name of the program containing varying out variable whose binding to modify
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>colorNumber</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The color number to bind the user-defined varying out variable to
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>index</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The index of the color input to bind the user-defined varying out variable to
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>name</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    The name of the user-defined varying out variable whose binding to modify
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="function">glBindFragDataLocationIndexed</code> specifies that the varying out variable <em class="parameter"><code>name</code></em> in
            <em class="parameter"><code>program</code></em> should be bound to fragment color <em class="parameter"><code>colorNumber</code></em> when the program is next
            linked. <em class="parameter"><code>index</code></em> may be zero or one to specify that the color be used as either the first or second color
            input to the blend equation, respectively.
        </p>
        <p>
            The bindings specified by <code class="function">glBindFragDataLocationIndexed</code> have no effect until <em class="parameter"><code>program</code></em>
            is next linked. Bindings may be specified at any time after <em class="parameter"><code>program</code></em> has been created. Specifically,
            they may be specified before shader objects are attached to the program. Therefore, any name may be specified in <em class="parameter"><code>name</code></em>,
            including a name that is never used as a varying out variable in any fragment shader object. Names beginning with <code class="constant">gl_</code> are
            reserved by the GL.
        </p>
        <p>
            If <em class="parameter"><code>name</code></em> was bound previously, its assigned binding is replaced with <em class="parameter"><code>colorNumber</code></em> and
            <em class="parameter"><code>index</code></em>. <em class="parameter"><code>name</code></em> must be a null-terminated string. <em class="parameter"><code>index</code></em> must be less than or equal to one,
            and <em class="parameter"><code>colorNumber</code></em> must be less than the value of <code class="constant">GL_MAX_DRAW_BUFFERS</code> if <em class="parameter"><code>index</code></em>
            is zero, and less than the value of <code class="constant">GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</code> if index is greater than or equal to one.
        </p>
        <p>
            In addition to the errors generated by <code class="function">glBindFragDataLocationIndexed</code>, the
            program <em class="parameter"><code>program</code></em> will fail to link if:
            </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem">
              <p>
                        The number of active outputs is greater than the value <code class="constant">GL_MAX_DRAW_BUFFERS</code>.
                    </p>
            </li>
            <li class="listitem">
              <p>
                        More than one varying out variable is bound to the same color number.
                    </p>
            </li>
          </ul>
        </div>
        <p>
        </p>
      </div>
      <div class="refsect1" id="notes">
        <h2>Notes</h2>
        <p>
            Varying out varyings may have locations assigned explicitly in the shader text using a <code class="code">location</code>
            layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text,
            that location is used and any location assigned with <code class="function">glBindFragDataLocation</code> is ignored.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>colorNumber</code></em> is greater than or equal to <code class="constant">GL_MAX_DRAW_BUFFERS</code>.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>colorNumber</code></em> is greater than or equal to <code class="constant">GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</code>
            and <em class="parameter"><code>index</code></em> is greater than or equal to one.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>index</code></em> is greater than one.
        </p>
        <p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>name</code></em> starts with the reserved <code class="constant">gl_</code> prefix.
        </p>
        <p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">program</code> is not the name of a program object.
        </p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p>
            <a class="citerefentry" href="glGetFragDataLocation.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetFragDataLocation</span></span></a> with a valid program object
            and the the name of a user-defined varying out variable
        </p>
        <p>
            <a class="citerefentry" href="glGetFragDataIndex.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetFragDataIndex</span></span></a> with a valid program object
            and the the name of a user-defined varying out variable
        </p>
      </div>
      <div class="refsect1" id="versions">
        <h2>Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
            <colgroup>
              <col style="text-align: left; "/>
              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">
                 
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
                <span class="bold"><strong>OpenGL Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function / Feature Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.4</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.5</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">
                  <code class="function">glBindFragDataLocationIndexed</code>
                </td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="glCreateProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glCreateProgram</span></span></a>,
            <a class="citerefentry" href="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>
            <a class="citerefentry" href="glGetFragDataLocation.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetFragDataLocation</span></span></a>,
            <a class="citerefentry" href="glGetFragDataIndex.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetFragDataIndex</span></span></a>
            <a class="citerefentry" href="glBindFragDataLocation.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindFragDataLocation</span></span></a>
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p>
      </div>
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